G4+ fault codes/ground issues

[Guest]

So ive installed an extreme into a v5 running v10 sti ej25 and came up with these faults:

An temp 1 error high - ect

An temp 2 error low - iat

An 3 error high - tps

An 4 error high - map

Now pin b136-17 is listed as ground so i connected it to one of the ground pins on the extreme loom plug. Is that correct?

Appears that the ground im using for iat/tps/map is incorrect. Its connected to sensor ground. If i cut this i lose the 3 associated errors.

Now theres these to choose from:

Ground

Ground

Shield/gnd

Sensor ground

Any ideas?

[Rosssub]

Firstly note that the plug numbers change between these pinouts (134 & 136).

The version 5/6 ECU pinout shows nothing allocated to pin 136/17

Version 5/6 ECU pinout:

http://www.brdevelopments.com/docs/MY99ecu.pdf

The version 5/6 pinout shows 134/17 is the ground for the ignition system.

The BE/BH pinout, also shows no allocation to 136/17 (pin 120)

BE/BH Rev A-C ECU pinout:

http://www.brdevelopments.com/docs/MY99%20Legacy%20TwinTurbo%20ECU%20pinout.pdf

But again lists an ignition earth at 134/17 (pin 104)

The Link G4+ plug in pin out (134&136swap) shows 136/17 as the only ECU ground. But this pin has nothing on the V5/6 and BE/BH pinout.

Link G4+ install (plug in), page 22 figure 9.1

http://www.linkecu.bg/downloads/installation/SubaruV5to6.pdf

I would try running 134/17 and 136/17 straight to the chassis.

The link G4+ wire in install shows both GROUND pins earthing separately straight to the block, page 26 figure 10.1

Link G4+ install (wire in)

http://www.enginelogics.com/wp-content/uploads/pdf/g4-wiring-install-manual.pdf

I think the sensor ground is correct. But the Link G4+ isn't earthed properly. So running both GROUND pins to the block might sort out the sensor faults.

Edited November 9, 2015 by Rosssub

[Guest]

[Guest]

Yea the ground side of things is pretty confusing. It also says in help file to ground the 2 black grounds on plug to engine not chassis. Theres also another black ground on the b plug. I was guessing the grounding for the 4 or so required sensors/injectors etc was linked internally or something.

[boon]

Yeah check your ECU grounds, sounds like you have a pretty nasty ground loop in there somewhere.

As for grounding to the engine not the chassis, if your ECU->Chassis Ground is 0 ohms, and your Engine->Chassis Ground is 0 ohms, and they damn well should be pretty close to it, then functionally the ECU IS grounded to the engine, it's just using the chassis as a piece of wire.

[Guest]

Ecu grounds are correct by my mind and also checked with link. Now showing tps/map/ect/iat error input at 5v.

[boon]

Get your multimeter, check resistance between everything that should be ground and like, the gearbox tunnel.

[Guest]

Got tps working now odd tho as value is higher at 0% than 100%. Will check map pinout see if we have 5v there. No idea on ect as that wirings never been touched. Everything was moved pin by pin. Gearbox ground is good, mani hasnt been touched, starter ground back in place, ecu ground out now correct, sensor grounds all correct. All i did was cut and connected wire by wire. Getting mad.

[gotasuby]

Your tps Gnd and +5v not round wrong way?

[Guest]

Only error left is map now. Have 4.99v, 5v and 0.03v on the map plug. Map signal is wired to an volt 2, 5v to 5v out via tb and sensor ground as per ecu.

[Guest]

Ok so 4.99v is on ground pin at sensor so ill strip loom back tomorrow and check colours.

[Guest]

If a map sensor has no sensor ground connected will it show 5v across input/signal pins? My spare map an volt shows 5v across pins either way with 5v input connected.

[Guest]

Map sorted now and few wiring discrepancies fixed. Showing no signal on di2/right vvt cam position. Starts/fires then dies.

[Guest]

Ok so starts and runs now. Somethings way off have had to increase fuel from 11 to 17ms to get 14afr. Cant find where you change Trigger 2/cam position arming voltage? That doesnt change with rpm which seems weird or is that normal with optical/hall sensors?

[Guest]

Have a funny feeling the crank sensor shield isnt earthed. Remember someone saying the tacho/rpm is linked to crank sensor is that correct? If so would explain why the tacho is having seizures and hopefully be my problem.

[gotasuby]

That could be a problem, yes

[Guest]

Nope not that i had grounded the shield. With vvt cam control turned off it runs perfectly and no issues with tacho. Wiring is correct on both cam sensors and solenoids and all settings correspond to old map that worked fine.

[gotasuby]

What does vvt screen say when it's on? Any errors? Have you set the offsets?

Edited November 21, 2015 by gotasuby

[Guest]

No errors, timings calibrated and vvt offset set. Both solenoids test fine. Will grab a pic shortly.

[Guest]

If i set the inlet target too 0 it still misses and farts around the vvt has to be turned off for it to run clean. Still needs 17ms master to run at target afr and it was 11ms with old ecu. Cam trigger signals are on correct inputs.

[Guest]

[gotasuby]

Where is your power taken from?

[Guest]

+14v ignition wire. Was working mint with plugin. Made a loom for coils, cam solenoids and sensors all sensor grounds and +14v are shared.

[Guest]

Ok so appears both of my cam sensors are working mint now. The missing issue is avcs related as per vid disregard the errors. With zero avcs target once it gets above lockout it runs 49%d/c and 30%d/c and no change in avcs degree. Something hinky there but wiring is correct on cam sensors/solenoids.

Also no 12v at idle solenoid buggered if i know where that 12v feed comes from.

[Guest]

Somehow my left avcs solenoid is connected to fuel pump. If i unplug the left sol it kills the pump. If i test/pwm that solenoid it pulses normally and doesnt effect the fuel pump in run times. Wiring is same as it was when running so fckd if i know. Avcs sensor grounds are spliced into sensor ground. All 12v on sensors/coil packs are spliced into the ignition relay/12v output. Fuel pump relay and ignition relay share ignition feed as switch wire.

Plain english to someone?